blocks|key|3003039|text|它不是自动的。你的top函数看起来没问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3003040|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It is not automatic. Your top function looks ok.

blocks|key|286966|text|我知道现在已经很晚了，尽管有一个更方便的方法来解决这类问题！其他的解决方案相当混乱；我是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|286967|$protocol+=+stripos($_SERVER['SERVER_PROTOCOL'],'https')+===+0+?+'https://'+:+'http://';|code-block|syntax|javascript|286968|...or即使没有条件，如果你喜欢的话：|286969|$protocol+=+strtolower(substr($_SERVER["SERVER_PROTOCOL"],0,strpos(+$_SERVER["SERVER_PROTOCOL"],'/'))).'://';|286970|看看+|offset|length|style|BOLD|286971|entityMap^0|0|0|0|0|0|2|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I know it's late, although there is a much more convenient way to solve this kind of problem! The other solutions are quite messy; this is how I would do it:

<pre><code>$protocol = stripos($_SERVER['SERVER_PROTOCOL'],'https') === 0 ? 'https://' : 'http://';
</code></pre>

...or even without condition if you prefer:

<pre><code>$protocol = strtolower(substr($_SERVER["SERVER_PROTOCOL"],0,strpos( $_SERVER["SERVER_PROTOCOL"],'/'))).'://';
</code></pre>

Have a look at <a href="http://php.net/manual/en/reserved.variables.server.php" rel="nofollow noreferrer"><code>$_SERVER["SERVER_PROTOCOL"]</code></a>

blocks|key|3003042|text|这对我很管用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3003043|if+(isset($_SERVER['HTTPS'])+&&
++++($_SERVER['HTTPS']+==+'on'+%7C%7C+$_SERVER['HTTPS']+==+1)+%7C%7C
++++isset($_SERVER['HTTP_X_FORWARDED_PROTO'])+&&
++++$_SERVER['HTTP_X_FORWARDED_PROTO']+==+'https')+{
++$protocol+=+'https://';
}
else+{
++$protocol+=+'http://';
}|code-block|syntax|javascript|3003044|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This works for me

<pre><code>if (isset($_SERVER['HTTPS']) &amp;&amp;
 ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] == 1) ||
 isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &amp;&amp;
 $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 $protocol = 'https://';
}
else {
 $protocol = 'http://';
}
</code></pre>

blocks|key|290345|text|以下是一些更改：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|290346|function+siteURL()+{
++$protocol+=+((!empty($_SERVER['HTTPS'])+&&+$_SERVER['HTTPS']+!=+'off')+%7C%7C+
++++$_SERVER['SERVER_PORT']+==+443)+?+"https://"+:+"http://";
++$domainName+=+$_SERVER['HTTP_HOST'];
++return+$protocol.$domainName;
}|code-block|syntax|javascript|290347|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Some changes:

<pre><code>function siteURL() {
 $protocol = ((!empty($_SERVER['HTTPS']) &amp;&amp; $_SERVER['HTTPS'] != 'off') || 
 $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
 $domainName = $_SERVER['HTTP_HOST'];
 return $protocol.$domainName;
}
</code></pre>

blocks|key|3003052|text|捷径|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3003053|$scheme+=+$_SERVER['REQUEST_SCHEME']+.+'://';|code-block|syntax|javascript|3003054|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

short way

<pre><code>$scheme = $_SERVER['REQUEST_SCHEME'] . '://';
</code></pre>

blocks|key|3216417|text|因为根据我的观点，测试端口号不是一个好的做法，所以我的解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3216418|define('HTTPS',+isset($_SERVER['HTTPS'])+&&+filter_var($_SERVER['HTTPS'],+FILTER_VALIDATE_BOOLEAN));|code-block|syntax|javascript|3216419|如果HTTPS设置为"1“、"true”、"on“或"yes”，则$_SERVER['HTTPS']常量返回TRUE。否则返回FALSE。|offset|length|style|CODE|3216420|entityMap^0|0|0|2|5|X|H|1I|4|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|N|$]]

Because testing port number is not a good practice according to me, my solution is:

<pre><code>define('HTTPS', isset($_SERVER['HTTPS']) &amp;&amp; filter_var($_SERVER['HTTPS'], FILTER_VALIDATE_BOOLEAN));
</code></pre>

The <code>HTTPS</code>constant returns <code>TRUE</code> if <code>$_SERVER['HTTPS']</code> is set and equals to "1", "true", "on" or "yes".
Returns FALSE otherwise.

blocks|key|287887|text|对于除IIS之外的任何系统，这足以定义站点自身URL：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287888|$siteURL='http'.(empty($_SERVER['HTTPS'])?'':'s').'://'.$_SERVER['HTTP_HOST'].'/';|code-block|syntax|javascript|287889|或|287890|$siteURL='http'.(empty($_SERVER['HTTPS'])?'':'s').'://'.$_SERVER['SERVER_NAME'].'/';|287891|取决于你到底想要什么：HTTP_HOST+vs.+SERVER_NAME|offset|length|287892|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2297403/http-host-vs-server-name^0|0|0|0|0|B|P|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

For any system except IIS this is quite enough to define site self URL:

<pre><code>$siteURL='http'.(empty($_SERVER['HTTPS'])?'':'s').'://'.$_SERVER['HTTP_HOST'].'/';
</code></pre>

or 

<pre><code>$siteURL='http'.(empty($_SERVER['HTTPS'])?'':'s').'://'.$_SERVER['SERVER_NAME'].'/';
</code></pre>

depends on what you exactly want:
<a href="https://stackoverflow.com/questions/2297403/http-host-vs-server-name">HTTP_HOST vs. SERVER_NAME</a>

blocks|key|3216454|text|在代理的情况下，SERVER_PORT可能不会给出正确的值，所以这对我来说是有效的-|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3216455|$protocol+=+((!empty($_SERVER['HTTPS'])+&&+$_SERVER['HTTPS']+!=+'off')+%7C%7C+$_SERVER['SERVER_PORT']+==+443+%7C%7C+$_SERVER['HTTP_X_FORWARDED_PORT']+==+443)+?+"https://"+:+"http://"|code-block|syntax|javascript|3216456|entityMap^0|8|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

In case of proxy the <code>SERVER_PORT</code> may not give the correct value so this is what worked for me -

<pre><code>$protocol = ((!empty($_SERVER['HTTPS']) &amp;&amp; $_SERVER['HTTPS'] != 'off') || $_SERVER['SERVER_PORT'] == 443 || $_SERVER['HTTP_X_FORWARDED_PORT'] == 443) ? "https://" : "http://"
</code></pre>

blocks|key|290367|text|使用此服务器变量获取协议详细信息：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|290368|+$scheme+=+$_SERVER['REQUEST_SCHEME']+.+'://';
+echo+$scheme;+//it+gives+http://+or+https://|code-block|syntax|javascript|290369|请注意，此服务器变量不可靠。有关更多信息，请访问：Is+$_SERVER['REQUEST_SCHEME']+reliable?|offset|length|290370|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/18008135/is-serverrequest-scheme-reliable^0|0|0|P|13|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Use this server variable to get the protocol details:

<pre><code> $scheme = $_SERVER['REQUEST_SCHEME'] . '://';
 echo $scheme; //it gives http:// or https://
</code></pre>

Note that this server variable is unreliable. For more information take a look at:
<a href="https://stackoverflow.com/questions/18008135/is-serverrequest-scheme-reliable">Is $_SERVER[&#39;REQUEST_SCHEME&#39;] reliable?</a>

blocks|key|287884|text|$protocal+=+'http';
if+($_SERVER['HTTP_X_FORWARDED_PROTO']+==+'https'+%7C%7C+$_SERVER['HTTPS']+==+'on')+{$protocal+=+'https';}


echo+$protocal;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|287885|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$protocal = 'http';
if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' || $_SERVER['HTTPS'] == 'on') {$protocal = 'https';}


echo $protocal;
</code></pre>

blocks|key|3003102|text|我知道这是一个老问题，但我今天遇到了这个问题，因为我需要在我的网站上测试这个问题。上面的答案似乎是不必要的复杂。要建立站点协议，您所要做的就是测试$_SERVER['HTTPS']|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3003103|如果协议使用的是HTTPS，那么$_SERVER['HTTPS']将返回'on‘。如果不是，变量将保持为空。例如：|3003104|//++test+if+HTTPS+is+being+used.++If+it+is,+the+echo+will+return+'$SSL_test:+on'.++If+not+HTTPS,+'$SSL_test'+will+remain+empty.|3003105|$SSL_test+=+$_SERVER['HTTPS'];|3003106|echo+'$SSL_test:+'.$SSL_test.'';

if($SSL_test+==+true)+{
++++echo+'You\'re+using+SSL';
}+else+{
++++echo+'You\'re+not+using+SSL';
}+|code-block|syntax|javascript|3003107|您可以使用上面的代码轻松干净地测试HTTPS，并相应地进行实现。:)|3003108|entityMap^0|21|H|0|G|H|0|0|3J|0|0|U|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|L|3|M|5|N|7|16|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|17|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|T|$]]

I know this is an old question but I came across this today since I needed to test for this in my site. It seems the answers above are needlessly complicated. To establish the site protocol, all you have to do is test <code>$_SERVER['HTTPS']</code>

If the protocol is using HTTPS, then <code>$_SERVER['HTTPS']</code> will return 'on'. If not, the variable will remain empty.
For example:
<code> 
// test if HTTPS is being used. If it is, the echo will return '$SSL_test: on'. If not HTTPS, '$SSL_test' will remain empty.

$SSL_test = $_SERVER['HTTPS'];

<pre><code>echo '&lt;p&gt;$SSL_test: '.$SSL_test.'&lt;/p&gt;';

if($SSL_test == true) {
 echo 'You\'re using SSL';
} else {
 echo 'You\'re not using SSL';
} 
</code></pre>

</code>
You can use the above to easily and cleanly test for HTTPS and implement accordingly. :)

blocks|key|3216412|text|使用Rid+Iculous的答案创建了一个函数，该函数在我的系统上有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3216413|function+site_protocol()+{
++++if(isset($_SERVER['HTTPS'])+&&+($_SERVER['HTTPS']+==+'on'+%7C%7C+$_SERVER['HTTPS']+==+1)+%7C%7C+isset($_SERVER['HTTP_X_FORWARDED_PROTO'])+&&++$_SERVER['HTTP_X_FORWARDED_PROTO']+==+'https')++return+$protocol+=+'https://';+else+return+$protocol+=+'http://';
}|code-block|syntax|javascript|3216414|希望能有所帮助|3216415|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

made a function using the Rid Iculous's answer which worked on my system.

<pre><code>function site_protocol() {
 if(isset($_SERVER['HTTPS']) &amp;&amp; ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] == 1) || isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &amp;&amp; $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') return $protocol = 'https://'; else return $protocol = 'http://';
}
</code></pre>

Hope it helps

blocks|key|284772|text|我已经测试了most+voted+answer，但它对我不起作用，我最终使用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|284773|$protocol+=+isset($_SERVER['HTTPS'])+?+'https://'+:+'http://';|code-block|syntax|javascript|284774|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/15101409/797495^0|Q|6|6|G|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

I've tested the <a href="https://stackoverflow.com/a/15101409/797495">most voted answe</a>r and it didn't work for me, I ended up using:

<pre><code>$protocol = isset($_SERVER['HTTPS']) ? 'https://' : 'http://';
</code></pre>

blocks|key|290382|text|我是这么做的.它是Rid+Iculous答案的速记+if+else版本……|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|290383|$protocol+=+isset($_SERVER['HTTPS'])+&&+($_SERVER['HTTPS']+===+'on'+%7C%7C+$_SERVER['HTTPS']+===+1)+%7C%7C+isset($_SERVER['HTTP_X_FORWARDED_PROTO'])+&&+$_SERVER['HTTP_X_FORWARDED_PROTO']+===+'https'+?+'https'+:+'http';|code-block|syntax|javascript|290384|entityMap^0|N|2|Q|7|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|S|8|@]|E|@]|F|$J|K]]|$1|L|3|-4|5|6|7|T|8|@]|E|@]|F|$]]]|M|$]]

Here is how I do it ... it is a shorthand <code>if else</code> version of Rid Iculous's answer ...

<pre><code>$protocol = isset($_SERVER['HTTPS']) &amp;&amp; ($_SERVER['HTTPS'] === 'on' || $_SERVER['HTTPS'] === 1) || isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &amp;&amp; $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https' ? 'https' : 'http';
</code></pre>

blocks|key|3003110|text|摘自CodeIgniter：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3003111|if+(+!+function_exists('is_https'))
{
++++/**
+++++*+Is+HTTPS?
+++++*
+++++*+Determines+if+the+application+is+accessed+via+an+encrypted
+++++*+(HTTPS)+connection.
+++++*
+++++*+@return++bool
+++++*/
++++function+is_https()
++++{
++++++++if+(+!+empty($_SERVER['HTTPS'])+&&+strtolower($_SERVER['HTTPS'])+!==+'off')
++++++++{
++++++++++++return+TRUE;
++++++++}
++++++++elseif+(isset($_SERVER['HTTP_X_FORWARDED_PROTO'])+&&+strtolower($_SERVER['HTTP_X_FORWARDED_PROTO'])+===+'https')
++++++++{
++++++++++++return+TRUE;
++++++++}
++++++++elseif+(+!+empty($_SERVER['HTTP_FRONT_END_HTTPS'])+&&+strtolower($_SERVER['HTTP_FRONT_END_HTTPS'])+!==+'off')
++++++++{
++++++++++++return+TRUE;
++++++++}

++++++++return+FALSE;
++++}
}|code-block|syntax|javascript|3003112|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Extracted from CodeIgniter :

<pre><code>if ( ! function_exists('is_https'))
{
 /**
 * Is HTTPS?
 *
 * Determines if the application is accessed via an encrypted
 * (HTTPS) connection.
 *
 * @return bool
 */
 function is_https()
 {
 if ( ! empty($_SERVER['HTTPS']) &amp;&amp; strtolower($_SERVER['HTTPS']) !== 'off')
 {
 return TRUE;
 }
 elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &amp;&amp; strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https')
 {
 return TRUE;
 }
 elseif ( ! empty($_SERVER['HTTP_FRONT_END_HTTPS']) &amp;&amp; strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off')
 {
 return TRUE;
 }

 return FALSE;
 }
}
</code></pre>

blocks|key|3003145|text|我认为完整的函数应该是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3003146|function+siteURL()
{
++++$protocol+=++"http://";
++++if+(
++++++++//straight
++++++++isset($_SERVER['HTTPS'])+&&+in_array($_SERVER['HTTPS'],+['on',+1])
++++++++%7C%7C
++++++++//proxy+forwarding
++++++++isset($_SERVER['HTTP_X_FORWARDED_PROTO'])+&&+$_SERVER['HTTP_X_FORWARDED_PROTO']+==+'https'
++++)+{
++++++++$protocol+=+'https://';
++++}

++++$domainName+=+$_SERVER['HTTP_HOST'];
++++return+$protocol+.+$domainName;
}|code-block|syntax|javascript|3003147|备注：|3003148|3003149|您还应该查找HTTP_X_FORWARDED_PROTO+(例如，如果是代理服务器)依赖于443端口的|unordered-list-item|3003150|是不安全的(https可以在不同的端口上提供)+|3003151|REQUEST_SCHEME+not+reliable|3003152|3003153|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|X|8|@]|9|@]|A|$]]|$1|M|3|N|5|L|7|Y|8|@]|9|@]|A|$]]|$1|O|3|P|5|L|7|Z|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|S|$]]

I think the complete func should look like :

<pre><code>function siteURL()
{
 $protocol = "http://";
 if (
 //straight
 isset($_SERVER['HTTPS']) &amp;&amp; in_array($_SERVER['HTTPS'], ['on', 1])
 ||
 //proxy forwarding
 isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &amp;&amp; $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https'
 ) {
 $protocol = 'https://';
 }

 $domainName = $_SERVER['HTTP_HOST'];
 return $protocol . $domainName;
}
</code></pre>

Notes: 

<ul>
<li>you should look also for HTTP_X_FORWARDED_PROTO (e.g. if proxy
server) </li>
<li>relying on 443 port is not safe (https could be served on
different port) </li>
<li>REQUEST_SCHEME not reliable</li>
</ul>

blocks|key|286983|text|这是https或http的最佳解决方案，使用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|286984|<?php
$protocol+=+'//';++
$site_url+=+$protocol.$_SERVER["HTTP_HOST"];
?>|code-block|syntax|javascript|286985|但不能显示https或http，所以它只用于链接您的网站内容，如图片等。|286986|如果想在https中重定向您的站点，请在.htaccess文件中添加以下代码：|286987|<IfModule+mod_rewrite.c>
+RewriteCond+%25{HTTP:CF-Visitor}+'"scheme":"http"'
+RewriteRule+%5E(.*)$+https://www.your-domain.com$1+[L]
</IfModule>|286988|将www.your-domain.com更改为您的dowmain名称。|offset|length|style|BOLD|286989|entityMap^0|0|0|0|0|0|1|J|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|Z|8|@$O|10|P|11|Q|R]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

it's the best solution of https or http use this :

<pre class="lang-html prettyprint-override"><code>&lt;?php
$protocol = '//'; 
$site_url = $protocol.$_SERVER["HTTP_HOST"];
?&gt;
</code></pre>



But can't display https or http, so it only use to link your site content like image, etc.

if want to redirect your site in https, add this code in .htaccess file :

<pre class="lang-html prettyprint-override"><code>&lt;IfModule mod_rewrite.c&gt;
 RewriteCond %{HTTP:CF-Visitor} '"scheme":"http"'
 RewriteRule ^(.*)$ https://www.your-domain.com$1 [L]
&lt;/IfModule&gt;
</code></pre>



Change www.your-domain.com with your dowmain name.

blocks|key|3003155|text|我知道我在这个聚会上来得有点晚，但是如果你不喜欢使用$_SERVER，因为它在一些PHP框架上被强烈反对，甚至被停用；和你有一个apache+web服务器，你可以使用它的本机命令：-|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3003156|$protocol+=+apache_getenv('HTTPS')+?+'https:'+:+'http:';|code-block|syntax|javascript|3003157|entityMap^0|1N|1|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I know I'm a bit late to this party, but if you much prefer not using $_SERVER as it's strongly discouraged, and even deactivated on some PHP frameworks; and you have an apache web server, you can use it's native command thusly: -

<pre><code>$protocol = apache_getenv('HTTPS') ? 'https:' : 'http:';
</code></pre>

I've written a little function to establish the current site url protocol but I don't have SSL and don't know how to test if it works under https. Can you tell me if this is correct?

<pre><code>function siteURL()
{
 $protocol = (!empty($_SERVER['HTTPS']) &amp;&amp; $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
 $domainName = $_SERVER['HTTP_HOST'].'/';
 return $protocol.$domainName;
}
define( 'SITE_URL', siteURL() );
</code></pre>

Is it necessary to do it like above or can I just do it like?:

<pre><code>function siteURL()
{
 $protocol = 'http://';
 $domainName = $_SERVER['HTTP_HOST'].'/'
 return $protocol.$domainName;
}
define( 'SITE_URL', siteURL() );
</code></pre>

Under SSL, doesn't the server automatically convert the url to https even if the anchor tag url is using http? Is it necessary to check for the protocol?

Thank you!

PHP Get Site URL Protocol - http vs https

服务器

我已经写了一个小函数来建立当前的站点url协议，但我没有SSL，也不知道如何测试它是否在https下工作。你能告诉我这是否正确吗？function siteURL(){    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "http

问PHP Get站点URL协议- http vs https
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